Case Number: S2208000027 REV. A
Release Date:

August 2022

Symptom/Vehicle Issue: Cluster Message “Electric Mode Unavailable Cabin Heating or
Cooling” or “Electric Mode Temporarily Unavailable”, Vehicle Engine Runs All the Time Does Not
Enter Electric Vehicle (EV) Mode

Customer Complaint/Technician Observation: Customer states the vehicle does not go
into Electric mode, may or may not have a cluster message “Electric Mode Unavailable Cabin
Heating or Cooling”, scenarios below:
Scenario A) MIL lamp is on and/or pending DTCs
Technician observed - Electric mode unavailable message and one or all the following Diagnostic
Trouble Codes (DTC’s):
- P0E15-00 Hybrid/EV Battery Pack Coolant Heater “A” Control Performance – Electric Coolant
Heater (ECH) can be reset if not locked permanent. See Below.
- U1008-00 LIN BUS 1 – repair first
- U1124-00 Lost Communication with LIN ECU 4 – repair first
Scenario B) No MIL Lamp on and no pending faults active
- Verify High Voltage (HV) coolant heater status in noted repair procedure below:
If heater is locked follow procedure below based on the locked state
If heater is not locked, verify the vehicle is not in FUEL AND OIL REFRESH MODE
(FORM) see service diagnostics to clear or SOL case S2208000020.

NOTE: Vehicles that do not have a DTC can display the above message during
normal cold start operation until the vehicle warms for 10 minutes at idle and/or
3 minutes of driving, no repairs may be required. However, if the owner
complaint is vehicle does not go into Electric mode, verify the status of the ECH
to ensure it is not in a permanently locked state and/or the vehicle is in Fuel and
Oil Refresh Mode requiring extended fully warmed vehicle driving for up to two
hours.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020

Repair Procedure:
Heater status can be “Locked Until Next Start”, “Locked Until Service”, and/or “Locked
Permanent”, the status indicates there may be a system issue which has caused the heater
protection to engage. Some conditions that can contribute to the status change with the cooling
system (blockage / low coolant / trapped air), heater low voltage supply, and heater high voltage
supply issues need to be assessed and resolved prior to heater replacement. Failure to resolve the
contributing condition will result in a repeat failure and return visit for the customer.
To repair, start by performing the service diagnostics for any Low Voltage (LV), High Voltage
(HV) system DTC’s and U1008-00, and/or U1124-00. For intermittent concerns, clean and secure the
involved system component grounds (see below).
NOTE: Use wiTECH to verify the HV coolant heater status. The ECH status can be found in the
Hybrid Control Processor (HCP) under the data tab.
The status will be one of the following:
- OFF
o ECH operation is normal, continue with published service procedures to diagnose.
-

Locked Until Next Start
o The heater has detected an out-of-range low voltage, out to range high voltage, loss of
communication, or internal error
o The heater will re-attempt operation after a power-cycle

-

Locked Until Next Service
o The ECH has detected heating coolant difference for inlet and outlet temperatures
o Requires service inspection for leaks, air in the system, and ECH unlock.
o Follow the “Cabin Overheat Lock Reset” routine in wiTECH
▪ From the topology screen go to the HCP - Misc Functions Tab - Cabin Overheat
Lock Reset, follow wiTECH prompts
▪ DTC P0E15-00 Must be present to proceed with the Unlock
▪ DTC’s U1008-00 and U1124 must be resolved/cleared/not present to unlock
o Causes: system coolant leaks, power supply issues/connections at ECH or High Temp
AUX pump, the High Temp Aux Pump, restricted coolant lines (including frozen coolant
incorrect coolant mixture), air in system, and/or ECH internal failure.

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020

-

LOCKED PERMANENT
o The ECH must be replaced, this status can’t be recovered or reset
o This status sets when the ECH has gone into protection mode on the 3rd occurrence
o Causes: system coolant leaks, power supply issues/connections at ECH or High Temp
AUX pump, the High Temp Aux Pump, restricted coolant lines (including frozen coolant
incorrect coolant mixture), air in system, and/or ECH internal failure.

HV Coolant Heater Status

Locked
Permanent

Sensors

HV Coolant Heater Status

Off

Sensors

HV Coolant Heater Status

Locked Until
Next Service

Sensors

HCP / Data View

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020

Inspect the cooling system for any leaks or kinked damaged hoses, verify the coolant system is full
and run the High Temp Coolant Fill - AUX PUMP routine to purge the system for air as needed.

Inspect system grounds.

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020

G933A

NOTE : If all the above recommendations along with the published service diagnostic flow
charts have been completed, no further repairs are suggested at this time. Engineering is
evaluating a service software update that is estimated for release by the 4th quarter 2022.

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020